Futaba R2104GF 2.4G S-FHSS 4 Channel RX 4PL Receiver FEATURES: For use with the 4-PL S-FHSS four channel surface radio Normal and High-Speed Modes: Normal mode frame rate is (FHSS/S-FHSS) 13.63ms INCLUDES: Futaba R2104GF 2.4GHz FHSS 4-Channel Receiver with instruction sheet REQUIRES: Installing in model and connecting battery and servos Linking to transmitter